I thought about adding some interactions with the environment like that, but in the end I decided against it. Health actually regenerates automatically. But in retrospective I might have made that a bit too slow. I balanced the health regeneration during a phase when the game had no savepoints and not that many enemies, so it was supposed to keep the player alive throughout the whole game. But then I decided to increase the difficulty by adding more difficult rooms, but avoided frustration by adding a savepoint system. That made the slow health regeneration pretty meaningless.